Unable To Upload Photographs Using Tata Photon+

I bought a Tata Photon+ in Chennai recently. But, I am unable to upload photographs of size, say, above 150 KB. I am able to upload small photographs upto 150 KB after waiting for some time. But, in Bangalore, I used to upload photographs of size above 2 MB using my BSNL BB. I use the same laptop in both the cases. The customer support staff of Tata Photon washed their hands off saying it is the hardware problem. If I am able to browse, then there is nothing wrong with Tata Photon+, they said. The maximum speed that I got was 0.88 Mbps for download speed and 0.15 Mbps for upload speed. Okay. I could upload a screen-shot of 158 KB here. But, in other websites, I just can't do it. How can I overcome this problem? Kindly advise.